DNV magnetic field detector

Patent metadata

Field	Value
Publication number	US-10725124-B2
Application number	US-201815912461-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 20, 2014
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

First claim

What is claimed is:

1. A system for magnetic detection, comprising:
a magneto-optical defect center sensor comprising:
a magneto-optical defect center material comprising at least one magneto-optical defect center;
a radio frequency (RF) excitation source configured to provide RF excitations at various frequencies to the magneto-optical defect material;
an optical excitation source configured to provide optical excitation to the magneto-optical defect material;
an optical detector configured to receive the emitted optical signal from the magneto-optical defect center material, wherein the emitted optical signal varies in intensity based responsiveness of the magneto-optical defect center material to the optical excitation with RF excitations at various frequencies;
a controller configured to control the RF excitation source and the optical excitation source to provide a sequence of pulses to the magneto-optical defect center material at RF excitations at various frequencies;
wherein the controller is further configured to detect variations in the emitted optical signal based on responsiveness of the magneto-optical defect center material to the optical excitation at an RF excitation; and
wherein the controller is further configured to utilize RF excitations at various frequencies to detect vector variations in responsiveness of the magneto-optical defect center material.

2. The system of claim 1 , wherein the magneto-optical defect center sensor is configured to detect the magnetic field as a vector.

3. The system of claim 1 , wherein the magneto-optical defect center sensor is configured to detect the magnetic field in individual directions.

4. The system of claim 1 , wherein the magneto-optical defect center sensor further comprises:
a magnetic field generator comprising at least two magnetic field generators including a first magnetic field generator configured to generate a first magnetic field and a second magnetic field generator configured to generate a second magnetic field;
wherein the controller is further configured to:
modulate a first code packet and control the first magnetic field generator to apply a first time varying magnetic field at the magneto-optical defect center material based on the modulated first code packet, and
modulate a second code packet and control the second magnetic field generator to apply a second time varying magnetic field at the magneto-optical defect center material based on the modulated second code packet, wherein the first code packet and the second code packet are binary sequences which have a low cross correlation with each other, and each of the binary sequences has a good autocorrelation.

5. The system of claim 4 , wherein a direction of the first time varying magnetic field at the magneto-optical defect center material is different from a direction of the second time varying magnetic field at the magneto-optical defect center material.

6. The system of claim 5 , wherein the magneto-optical defect center sensor further comprises a reflector positioned about the magneto-optical defect center material to reflect a portion of light emitted from the magneto-optical defect center material.

7. The system of claim 1 , further comprising:
a first magnetic field sensor that includes the magneto-optical defect center sensor,
a second magnetic field sensor that includes a second magneto-optical defect center sensor, and
a position encoder component comprising a magnetic region configured to produce a magnetic field gradient from a first end of the magnetic region to the second end of the magnetic region.

8. The system of claim 7 , wherein the magnetic region comprises a ferromagnetic component.

9. The system of claim 7 , wherein the magnetic region comprises a magnetic polymer.

10. The system of claim 7 , further comprising a third magnetic field sensor and a fourth magnetic field sensor.

11. The system of claim 1 , further comprising:
a vehicle that includes the magneto-optical defect center sensor, wherein the magneto-optical defect center sensor is configured to detect a magnetic vector or a magnetic field;
one or more electronic processors configured to:
receive the magnetic vector of the magnetic field from the magneto-optical defect center sensor; and
a navigation control configured to navigate the vehicle based upon the presence of the magnetic vector.

12. The system of claim 1 , wherein the magneto-optical defect center material comprises a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers.

13. A system for magnetic detection, comprising:
a magneto-optical defect center sensor comprising:
a magneto-optical defect center material comprising a plurality of magneto-optical defect centers;
a radio frequency (RF) excitation source configured to provide RF excitation at various frequencies to the magneto-optical defect center material;
an optical excitation source configured to provide optical excitation to the magneto-optical defect center material;
an optical detector configured to receive an optical signal emitted by the magneto-optical defect center material, wherein the optical signal varies in intensity based on responsiveness of the magneto-optical defect center material to the optical excitation with RF excitation at various frequencies;
a controller configured to detect the optical signal emitted by the magneto-optical defect center material, wherein the controller is further configured to utilize the multiple RF excitations at various frequencies to detect vector variations in responsiveness of the magneto-optical defect center material; and

an array of sensors comprising the magneto-optical defect center sensor, wherein the array is configured to capture a first magnetic image and a second magnetic image; and
a processor communicatively coupled to the array, wherein the processor is configured to:
determine a background image based on the first magnetic image and identify discrepancies to the second magnetic image.

14. The system of claim 13 , wherein some sensors of the array are arranged on a surface area of a well pay zone, wherein some sensors of the array are positioned in locations within or near the well bore.

15. The system of claim 13 , wherein the processor is further configured to determine the background by subtracting the first magnetic image from the second magnetic image, such background being used with further magnetic images.

16. The system of claim 13 , wherein the discrepancies identify a ferromagnetic material.

17. The system of claim 13 , wherein the magneto-optical defect center material comprises a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers.

18. A system for magnetic detection, comprising:
a magneto-optical defect center sensor comprising:
a magneto-optical defect center means for generating an emitted optical signal comprising a plurality of magneto-optical defect centers;
a radio frequency (RF) excitation source configured to provide RF excitation at multiple frequencies to the magneto-optical defect center material;
an optical excitation source configured to provide optical excitation to the magneto-optical defect center material;
an optical detector configured to receive an optical signal emitted by the magneto-optical defect center means, wherein the optical signal is based on responsiveness of the magneto-optical defect center material to optical excitation and RF excitation at multiple frequencies; and,
a controller configured to detect the optical signal emitted by the magne

Assignees

• Lockheed Corp

Inventors

• Boesch Brian P
• Bruce Gregory Scott
• Cammerata Jeff D
• COAR David Nelson
• Egan Laird Nicholas
• Fisk Bryan Neal
• Lew Wilbur
• Manickam Arul
• SEKELSKY Stephen Michael
• Stetson Jr John B
• Kaup Peter G
• MILLER Julie Lynne
• Russo Jon C
• Stockman Emanuel Solomon
• Meyer Thomas J
• Krause James Michael
• Mabry James P
• Pepa Elton

Classifications

• B64U2201/10

  autonomous, i.e. by navigating independently from ground or air stations, e.g. by using inertial navigation systems [INS] · CPC title

• G01R33/032 Primary

  using magneto-optic devices, e.g. Faraday {or Cotton-Mouton effect} · CPC title

• G01C21/00

  Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 (measuring distance traversed on the ground by a vehicle G01C22/00; control of position, course, altitude or attitude of vehicles G05D1/00; traffic control systems for road vehicles involving transmission of navigation instructions to the vehicle G08G1/0968) · CPC title

• B64C2201/141

  Operations & Transport · mapped topic

• G05D1/101

  specially adapted for aircraft · CPC title